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Thread: Clogged pre-filter on a CDL vacuum filter

  1. #1
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    Default Clogged pre-filter on a 9" CDL vacuum filter

    I am learning how to use the 9" CDL vacuum filter but I imagine there are people here who have faced the same predicament with the larger versions. I put the orlon filter + 3 prefilters under the ring and clamped it down. Then I started adding 1 gallon of syrup. The first 2/3 flowed through, but the last 1/3 got stuck because the prefilter had a good 1/16"-1/8" thick layer of niter. The vacuum didn't suck it through either. How am I supposed to remove the prefilter when it is clamped down? I ended up pouring the stuck syrup back out so I could unclamp and remove a prefilter, then put it back together.

    83392786_10115247920941125_2562121762145828864_n.jpg
    Last edited by jdircksen; 02-12-2020 at 09:25 AM.
    2020: 31 taps. 3 full size steam table pans on a custom 6x water heater natural gas burner setup.
    2019: 31 taps on silvers. Back porch gas cook top with 2 full size steam table pans. An amazing 14.9 gallons in my backyard!
    2018: 22 taps on 9 silvers. Propane turkey fryer and full size steam table pan on electric stove. I made 4.25 gallons in my backyard!

  2. #2
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    If you have that much sugarsand (niter), just try smaller batches. I might even try using a conventional pre-filter or 2 to remove some before you pour it into the vacuum filter. This is a suggestion only, I have no experience using a vacuum filter.
    Dave Klish about 1320 taps in '15, downsized after I lost my help, about 450-500 planned for 2021 (and after?)
    2012 Mahindra 36 HP 4x4/ loader/cab/heat/AC:-)
    3x8 raised flue evaporator
    250 GPH converted to electric, RO by Ray Gingerich
    6.32 KW solar system, 1.48KW is battery backed up, all net metered
    http://s1041.photobucket.com/albums/...anssugarhouse/
    website: www.cnymaple.com

  3. #3
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    Are you using any Filter Aid? I used filter filter aid with mine last year and it worked great. It helps keep the filter from plugging up.
    Sugaring for 45+ years
    New Sugarhouse 14'x32'
    New to Me Algier 2'x8' wood fired evaporator
    225 Sugar Maples Currently,(105 on 3/16" and 110 on Shurflo 4008 vacuum, 10 gravity), (16,000 before being disabled)
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    2012 Kubota with forks to move wood around

  4. #4
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    I did add a tablespoon of diatomaceous earth and stir it up once the syrup started to collect on top of the filters. it didn't appear to make a difference. neither did turning the vacuum on.
    2020: 31 taps. 3 full size steam table pans on a custom 6x water heater natural gas burner setup.
    2019: 31 taps on silvers. Back porch gas cook top with 2 full size steam table pans. An amazing 14.9 gallons in my backyard!
    2018: 22 taps on 9 silvers. Propane turkey fryer and full size steam table pan on electric stove. I made 4.25 gallons in my backyard!

  5. #5
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    That photo doesn't look like the CDL vacuum filter we have? Way too much niter there. Was the syrup hot when you tried to filter it? You'll need a lot more DE than a tablespoon.
    Dr. Tim Perkins
    UVM Proctor Maple Research Ctr
    http://www.uvm.edu/~pmrc
    https://mapleresearch.org
    Timothy.Perkins@uvm.edu

  6. #6
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    Quote Originally Posted by DrTimPerkins View Post
    That photo doesn't look like the CDL vacuum filter we have? Way too much niter there. Was the syrup hot when you tried to filter it? You'll need a lot more DE than a tablespoon.
    Yes it was hot. I poured the syrup in as soon as it hit 59 brix. The felt filter was damp and cold from rinsing it out a couple hours prior.

    That is the new 9" one. The picture is after I removed the top ring that holds syrup and sits on top of the filters. When I removed the ring, the sediment stayed in place just like when you remove the ring around a cheesecake.
    Would having an overly hot fire cause more niter? Or 7 drops of Leader's defoamer in this gallon batch?

    the picture isn't showing up, but here is the 9" vacuum filter 82811255_2602003233250396_7023109640288206848_n.jpg
    Last edited by jdircksen; 01-27-2020 at 12:35 PM.
    2020: 31 taps. 3 full size steam table pans on a custom 6x water heater natural gas burner setup.
    2019: 31 taps on silvers. Back porch gas cook top with 2 full size steam table pans. An amazing 14.9 gallons in my backyard!
    2018: 22 taps on 9 silvers. Propane turkey fryer and full size steam table pan on electric stove. I made 4.25 gallons in my backyard!

  7. #7
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    Try using more DE and keep it stirred up as you turn on the vacuum. Looks like your filter is just clogging up too fast. More DE will slow the build-up down some and allow filtering to continue. Typically when clogging happens during pressure (or vacuum) filtering it means you need more DE. The DE is the filter media, not the cloths, so you want the cake to build up slowly and capture the niter as it does.

    As Dave suggested earlier, coarse prefiltering might help.
    Dr. Tim Perkins
    UVM Proctor Maple Research Ctr
    http://www.uvm.edu/~pmrc
    https://mapleresearch.org
    Timothy.Perkins@uvm.edu

  8. #8
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    I also vote for more DE, try about 1/2 cup in 1 gal, if 2 gal, try 3/4 cup. Then adjust as you gain experience. Also, mix in the DE well before you add it to the filter reservoir.
    Last edited by maple flats; 01-27-2020 at 06:53 PM.
    Dave Klish about 1320 taps in '15, downsized after I lost my help, about 450-500 planned for 2021 (and after?)
    2012 Mahindra 36 HP 4x4/ loader/cab/heat/AC:-)
    3x8 raised flue evaporator
    250 GPH converted to electric, RO by Ray Gingerich
    6.32 KW solar system, 1.48KW is battery backed up, all net metered
    http://s1041.photobucket.com/albums/...anssugarhouse/
    website: www.cnymaple.com

  9. #9
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    Got it. Thanks for the tips. I'll give it another try next run.
    2020: 31 taps. 3 full size steam table pans on a custom 6x water heater natural gas burner setup.
    2019: 31 taps on silvers. Back porch gas cook top with 2 full size steam table pans. An amazing 14.9 gallons in my backyard!
    2018: 22 taps on 9 silvers. Propane turkey fryer and full size steam table pan on electric stove. I made 4.25 gallons in my backyard!

  10. #10
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    I filtered another gallon batch today and I still don't have this fancy filter figured out. I discovered a pinhole leak in the weld holding the vacuum fitting (condensation drips out of it) and I'm wondering if that is affecting performance. I think what might be happening is that it isn't a clogged filter, rather the vacuum is lost due to the pinhole leak and syrup is no longer being drawn through the filter. Is that possible?

    Also, should I expect to run the vacuum multiple times for 1 gallon or should once do the trick? And do you wait until all the syrup is filtered before bottling? I think the vacuum is affected by opening the valve to fill a bottle.
    2020: 31 taps. 3 full size steam table pans on a custom 6x water heater natural gas burner setup.
    2019: 31 taps on silvers. Back porch gas cook top with 2 full size steam table pans. An amazing 14.9 gallons in my backyard!
    2018: 22 taps on 9 silvers. Propane turkey fryer and full size steam table pan on electric stove. I made 4.25 gallons in my backyard!

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